* policies)
*/
+#ifdef CONFIG_RT_GROUP_SCHED
+
+#define rt_entity_is_task(rt_se) (!(rt_se)->my_q)
+
static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
{
+#ifdef CONFIG_SCHED_DEBUG
+ WARN_ON_ONCE(!rt_entity_is_task(rt_se));
+#endif
return container_of(rt_se, struct task_struct, rt);
}
-#ifdef CONFIG_RT_GROUP_SCHED
-
static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
{
return rt_rq->rq;
#else /* CONFIG_RT_GROUP_SCHED */
+#define rt_entity_is_task(rt_se) (1)
+
+static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
+{
+ return container_of(rt_se, struct task_struct, rt);
+}
+
static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
{
return container_of(rt_rq, struct rq, rt);
static void update_rt_migration(struct rt_rq *rt_rq)
{
- if (rt_rq->rt_nr_migratory && (rt_rq->rt_nr_running > 1)) {
+ if (rt_rq->rt_nr_migratory && rt_rq->rt_nr_total > 1) {
if (!rt_rq->overloaded) {
rt_set_overload(rq_of_rt_rq(rt_rq));
rt_rq->overloaded = 1;
static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
{
+ if (!rt_entity_is_task(rt_se))
+ return;
+
+ rt_rq = &rq_of_rt_rq(rt_rq)->rt;
+
+ rt_rq->rt_nr_total++;
if (rt_se->nr_cpus_allowed > 1)
rt_rq->rt_nr_migratory++;
static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
{
+ if (!rt_entity_is_task(rt_se))
+ return;
+
+ rt_rq = &rq_of_rt_rq(rt_rq)->rt;
+
+ rt_rq->rt_nr_total--;
if (rt_se->nr_cpus_allowed > 1)
rt_rq->rt_nr_migratory--;
plist_del(&p->pushable_tasks, &rq->rt.pushable_tasks);
}
+static inline int has_pushable_tasks(struct rq *rq)
+{
+ return !plist_head_empty(&rq->rt.pushable_tasks);
+}
+
#else
+static inline void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
+{
+}
+
+static inline void dequeue_pushable_task(struct rq *rq, struct task_struct *p)
+{
+}
+
static inline
-void enqueue_pushable_task(struct rq *rq, struct task_struct *p) {}
-static inline
-void dequeue_pushable_task(struct rq *rq, struct task_struct *p) {}
-static inline
-void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
+void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+}
+
static inline
-void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
+void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+}
#endif /* CONFIG_SMP */
curr->se.exec_start = rq->clock;
cpuacct_charge(curr, delta_exec);
+ sched_rt_avg_update(rq, delta_exec);
+
if (!rt_bandwidth_enabled())
return;
if (!task_current(rq, p) && p->rt.nr_cpus_allowed > 1)
enqueue_pushable_task(rq, p);
-
- inc_cpu_load(rq, p->se.load.weight);
}
static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
dequeue_rt_entity(rt_se);
dequeue_pushable_task(rq, p);
-
- dec_cpu_load(rq, p->se.load.weight);
}
/*
#ifdef CONFIG_SMP
static int find_lowest_rq(struct task_struct *task);
-static int select_task_rq_rt(struct task_struct *p, int sync)
+static int select_task_rq_rt(struct task_struct *p, int sd_flag, int flags)
{
struct rq *rq = task_rq(p);
+ if (sd_flag != SD_BALANCE_WAKE)
+ return smp_processor_id();
+
/*
* If the current task is an RT task, then
* try to see if we can wake this RT task up on another
static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
{
- cpumask_var_t mask;
-
if (rq->curr->rt.nr_cpus_allowed == 1)
return;
- if (!alloc_cpumask_var(&mask, GFP_ATOMIC))
- return;
-
if (p->rt.nr_cpus_allowed != 1
- && cpupri_find(&rq->rd->cpupri, p, mask))
- goto free;
+ && cpupri_find(&rq->rd->cpupri, p, NULL))
+ return;
- if (!cpupri_find(&rq->rd->cpupri, rq->curr, mask))
- goto free;
+ if (!cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
+ return;
/*
* There appears to be other cpus that can accept
*/
requeue_task_rt(rq, p, 1);
resched_task(rq->curr);
-free:
- free_cpumask_var(mask);
}
#endif /* CONFIG_SMP */
/*
* Preempt the current task with a newly woken task if needed:
*/
-static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p, int sync)
+static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p, int flags)
{
if (p->prio < rq->curr->prio) {
resched_task(rq->curr);
if (p)
dequeue_pushable_task(rq, p);
+#ifdef CONFIG_SMP
+ /*
+ * We detect this state here so that we can avoid taking the RQ
+ * lock again later if there is no need to push
+ */
+ rq->post_schedule = has_pushable_tasks(rq);
+#endif
+
return p;
}
static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
-static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
-{
- int first;
-
- /* "this_cpu" is cheaper to preempt than a remote processor */
- if ((this_cpu != -1) && cpu_isset(this_cpu, *mask))
- return this_cpu;
-
- first = first_cpu(*mask);
- if (first != NR_CPUS)
- return first;
-
- return -1;
-}
-
static int find_lowest_rq(struct task_struct *task)
{
struct sched_domain *sd;
return -1; /* No targets found */
/*
- * Only consider CPUs that are usable for migration.
- * I guess we might want to change cpupri_find() to ignore those
- * in the first place.
- */
- cpumask_and(lowest_mask, lowest_mask, cpu_active_mask);
-
- /*
* At this point we have built a mask of cpus representing the
* lowest priority tasks in the system. Now we want to elect
* the best one based on our affinity and topology.
* Otherwise, we consult the sched_domains span maps to figure
* out which cpu is logically closest to our hot cache data.
*/
- if (this_cpu == cpu)
- this_cpu = -1; /* Skip this_cpu opt if the same */
+ if (!cpumask_test_cpu(this_cpu, lowest_mask))
+ this_cpu = -1; /* Skip this_cpu opt if not among lowest */
for_each_domain(cpu, sd) {
if (sd->flags & SD_WAKE_AFFINE) {
- cpumask_t domain_mask;
- int best_cpu;
+ int best_cpu;
- cpumask_and(&domain_mask, sched_domain_span(sd),
- lowest_mask);
+ /*
+ * "this_cpu" is cheaper to preempt than a
+ * remote processor.
+ */
+ if (this_cpu != -1 &&
+ cpumask_test_cpu(this_cpu, sched_domain_span(sd)))
+ return this_cpu;
- best_cpu = pick_optimal_cpu(this_cpu,
- &domain_mask);
- if (best_cpu != -1)
+ best_cpu = cpumask_first_and(lowest_mask,
+ sched_domain_span(sd));
+ if (best_cpu < nr_cpu_ids)
return best_cpu;
}
}
* just give the caller *something* to work with from the compatible
* locations.
*/
- return pick_optimal_cpu(this_cpu, lowest_mask);
+ if (this_cpu != -1)
+ return this_cpu;
+
+ cpu = cpumask_any(lowest_mask);
+ if (cpu < nr_cpu_ids)
+ return cpu;
+ return -1;
}
/* Will lock the rq it finds */
return lowest_rq;
}
-static inline int has_pushable_tasks(struct rq *rq)
-{
- return !plist_head_empty(&rq->rt.pushable_tasks);
-}
-
static struct task_struct *pick_next_pushable_task(struct rq *rq)
{
struct task_struct *p;
pull_rt_task(rq);
}
-/*
- * assumes rq->lock is held
- */
-static int needs_post_schedule_rt(struct rq *rq)
-{
- return has_pushable_tasks(rq);
-}
-
static void post_schedule_rt(struct rq *rq)
{
- /*
- * This is only called if needs_post_schedule_rt() indicates that
- * we need to push tasks away
- */
- spin_lock_irq(&rq->lock);
push_rt_tasks(rq);
- spin_unlock_irq(&rq->lock);
}
/*
unsigned int i;
for_each_possible_cpu(i)
- alloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
+ zalloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
GFP_KERNEL, cpu_to_node(i));
}
#endif /* CONFIG_SMP */
dequeue_pushable_task(rq, p);
}
+unsigned int get_rr_interval_rt(struct task_struct *task)
+{
+ /*
+ * Time slice is 0 for SCHED_FIFO tasks
+ */
+ if (task->policy == SCHED_RR)
+ return DEF_TIMESLICE;
+ else
+ return 0;
+}
+
static const struct sched_class rt_sched_class = {
.next = &fair_sched_class,
.enqueue_task = enqueue_task_rt,
.rq_online = rq_online_rt,
.rq_offline = rq_offline_rt,
.pre_schedule = pre_schedule_rt,
- .needs_post_schedule = needs_post_schedule_rt,
.post_schedule = post_schedule_rt,
.task_wake_up = task_wake_up_rt,
.switched_from = switched_from_rt,
.set_curr_task = set_curr_task_rt,
.task_tick = task_tick_rt,
+ .get_rr_interval = get_rr_interval_rt,
+
.prio_changed = prio_changed_rt,
.switched_to = switched_to_rt,
};